Mazzaglia is charged with first-degree murder in the death of Lizzi Marriott, 19.

With Mazzaglia's ex-girlfriend Kat McDonough off the stand, the pace of testimony has picked up considerably, and prosecutors on Tuesday called nine witnesses, including a DNA expert, a tugboat captain and a theater producer.

Brian Barbato, an assistant football coach at the University of New Hampshire and former neighbor of Mazzaglia's and McDonough's, described McDonough as oddly quiet, saying Mazzaglia was clearly in control of the relationship.

"He came across as very bold, excited to brag about his Brazilian jujitsu or whatever it was, and World of Warcraft," Barbato said. "It was almost like, as a football coach, he saw me as another alpha personality."

Another witness who testified was Randall Bolduc, a dog walker who saw drag marks at Peirce Island the morning after police said Marriott's body was brought there.

"I'd probably gone to the dog park hundreds of times," Bolduc said. "It just didn't look like anything I'd seen before on the ground. It merited enough for me to want to take a look at it to see what it was."

The jury heard testimony from three police officers, including the Dover detective who searched the apartment for evidence and reassembled torn-up letters.

Former Chester Officer Nicholas McLellan testified that he got a call on Thursday morning from Marriott's father, who said she hadn't been seen since Tuesday night. McLellan said he started an investigation, pulling her cellphone records and talking to people close to her.

McLellan said Mazzagia sounded nervous when he spoke with him later that day by phone and asked whether he had seen Marriott.

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